268 THE CHICAGO ACADEMY OF SCIENCES. 
Smithsonian collection, is a form of modicella. The cotype has a 
narrow reflection of the inner lip which leaves a rather small umbilical 
chink. A comparison of the figure on plate XXXI, which is a photo- 
graph of the cotype, with Tryon’s figure 3, plate 18, of his continu- 
ation of Haldeman’s Monograph, will serve to show how little depend- 
ence can be placed upon a figure made by the ordinary artist in correctly 
depicting the shells of mollusks. 
Galba humilis rustica (Lea). Plate XXXI, figures 10-14. 
Lymnea rustica LEA, Proc. Amer. Phil. Soc., II, p. 33, 1841; Trans. Amer. 
Phil. Soc., IX, p. 10, 1844; Obs., IV, p. 10, 1848.—Scupper, Bull. Nat. Mus., 23, 
pp. 33, 44, 201, 1885. 
Lymnea rustica WHEATLEY, Cat. Sh. U. S., p. 23, 1843. 
Limnea rustica BINNEY, Check List, p. 12, 1860; L. & F.-W. Sh. N. A,, 
II, p. 65, fig. 106, 1865.—CLEssin, Mal. Blatt., n. s., III, p. 81, 1881—CkKtt., Ann. 
Miao Ni. EE Ser 5, XOX, pe 2767 188i 
SHELL: Small, elongated, subfusiform ; periostracum light yellow- 
ish horn, darker in some specimens; surface shining, growth lines 
coarse, spiral lines absent or very faint; whorls 5 to 5%, convex, rather 
slowly increasing in diameter, the body whorl suddenly enlarging; 
spire long, very acute, generally a trifle longer than the aperture; 
nuclear whorls resembling those of modicella; sutures impressed; 
aperture usually narrowly elliptical; outer lip thin, sometimes with a 
varix; inner lip narrow, reflected, the lower part turned up, the upper 
part at its junction with the parietal wall impressed and flattened, 
forming a slight plait; umbilical chink usually very narrow, in some 
specimens nearly closed; axis as in modicella. 
Length. Breadth. Aperture length. Breadth. 
7.50 4.00 3.75 1.50 mill. Smithsonian specimen 
8.75 4.00 4.50 Dal Mohawk, N. Y. 
8.50 4.00 4.00 2008 ae aS S 
9.75 4.50 5.00 2.50 “ Albuquerque, N. M. 
10.50 4.75 5.50 2500 = i 5 
8.50 4.00 4.00 2.00 » : 
Rare 4.00 4.00 200 == a oliet elle 
8.50 4.25 4.50 22D 4 oF aos 
9.75 4.75 4.90 PH. oY Alpena, Mich. 
9.00 4.00 4.00 2.50 “ Cedar Lake, Mich. 
10.00 4.80 4.50 2505 tr sf = 
Types: Not in existence; autotype, one specimen, Smith. Inst., 
No. 118652. 
Type Locauity: Poland, Ohio. 
ANIMAL: Not differing externally from modicella. 
Jaw: As in modicella, 
